ArduPilot / MethodicConfigurator / 23187504490

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fix(scroll): prevent scroll unbinding when cursor moves to child widgets on Windows

On Windows, tkinter fires <Leave> events on the parent view_port when
the cursor moves to a child widget (Label, Entry, etc.) inside the
scroll area. This caused on_leave() to unbind the <MouseWheel> handler,
breaking scroll functionality over all non-empty areas.

The fix checks whether the cursor is still physically within the canvas
bounds before unbinding scroll events. If the cursor moved to a child
widget (still inside the scroll area), the scroll handler remains active.

This also handles the edge case where the widget has been destroyed by
catching TclError and related exceptions gracefully.

Fixes #460

Signed-off-by: Yash Goel <yashhzd@users.noreply.github.com>

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